Analysis and prevention of Kovar phase transformation failures in cryogenically operated sensors and instruments

J. Brian Toft; Thomas G. Evans

doi:10.1117/12.23070

1 November 1990 Analysis and prevention of Kovar phase transformation failures in cryogenically operated sensors and instruments

J. Brian Toft, Thomas G. Evans

Author Affiliations +

Proceedings Volume 1340, Cryogenic Optical Systems and Instruments IV; (1990) https://doi.org/10.1117/12.23070
Event: 34th Annual International Technical Symposium on Optical and Optoelectronic Applied Science and Engineering, 1990, San Diego, CA, United States

Abstract

Metallurgical and physical property changes in Kovar, an Fe-Ni-Co alloy, associated with the phase transformation phenomenon and factors which affect the stability of austenitic structures are discussed. Martensitic phase transformation is considered to be a critical concern to designers of cryogenic instruments for avoiding transformation-induced failures. Problems under consideration include properties of iron-nickel alloys and Kovar alloy, austenite stability in Kovar alloy, and phase transformation testing.

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J. Brian Toft and Thomas G. Evans "Analysis and prevention of Kovar phase transformation failures in cryogenically operated sensors and instruments", Proc. SPIE 1340, Cryogenic Optical Systems and Instruments IV, (1 November 1990); https://doi.org/10.1117/12.23070

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